◊ Jasper is a form of opaque chalcedony that is classified as a cryptocrystalline form of silica. It is composed of very fine inter growths of quartz and morganite. Willow Creek Jasper, from Eagle, Idaho, is known for its subtle pastel colors, mostly browns, greens and pinks, and its squiggly line patterns.

◊ Druzy (druse) is a coating of fine crystals on a rock fracture surface, vein, or within a geode. Druzy is most commonly found in quartz.